Window-ventilator.



UNITED STATES' JOHN A. RUSSELL, oF EANGELEY, MAINE.

PATENT OFFICE.

WIN DOW-V-ENTILATO R.

SPECIFICATION arming part of Letters raten nacemos, dated .my 22, 1902.

Application filed March 11J 1901. sain No. 50.550. (No man.)

To all whom it may concern: Y y

Be it known that I, JOHN A. RUSSELL, of Rangeley, in the county of Franklin and State of Maine, have invented certain new and useful Improvements in Window-Ventilatore, of which the following is a specification.

Thisinvention has reference to ventilatin g appliances, whereby fresh air may be admitted in limited quantities to a room Without opening the window.

The invention consists in a window-sash ventilator comprising a series of perforations in the frame of a Window-sasha hinged' plate or shutter adapted to cover such perforaticns, i

and means hereinafter' described for locking the plate in its closed and its wide-open positions. u

In the accompanying drawings, Figure 1 represents a cross-section of a window-sash, showing in plan the device embodying my invention as applied to the lower bar of the sash, the shutter being closed. Fig. 2 represents a view similar to Fig. l, except that the shutter is here shown in its wide-open position. Fig. 3 represents an elevation of a portion of aWindow-sash with my device applied thereto. Fig. 4' represents 'a'section on line 4 4 of Fig. 3. Fig. 5 represents a view similar to Fig. 4, showing' the shutter open.

Thesame reference characters designate the same parts in all the figures. Y

Referring to the drawings, the bar- 1 of the frame of a window-sash is perforated by a series of holes 2, through which 'a free flow of air maybehad-from the outer atmosphere into a room. In order to regulate the admission of air, a plate or shutter 3 is provided and is secured to the sash-bar by hinges 4 4, about which it is adapted to swing freely. The shutter 3 is attached to the sash-bar l on its outer side, and on the inner side of the sash-bar is mounted a device for operating and locking the shutter, consisting of a bellcrank lever 6 7, connected with the shutter by 'a link 5, attached at one end'to the lever-arm.v

6 and at the other by any suitable means to the shutter. The bell-crank lever is mounted over one ofthe perforations 2, into which one of its arms may project and through which the link 5 extends. This bell-crank lever is preferably constructed of stiff Wire or other suitable material and made in a peculiar lform.-AV The arm 6 of the lever, to which the link 5 is connected, is formed as an offset in a substantially straight piece similar to the crank of an engine, having a main bearing on each side of the connecting-rod, the ends 10 and 1l of which constitute trunnions about which thelever turns, and are held in bearings 8 and 9, attached to the sash-baron either side of one of the holes 2. The other or operating arm 7 is formed of a .second piece of material bent into U shape and suitably 4secured at its ends to the piece l0 1l, one end of the vpiece 7- on each side of the offset G. If desired, the whole lever may be formed of one piece of suitable form, though the formv described is preferable. The arms 6 and 7 are set approximately at right angles to each other, and the fulcrum of the lever, which is formed by the bearings 8 and 9, in which the trunnions lO and ll are held, is set at a slight distance from the surface of the sash-banso that when the end of the arm 7 restsagainst the sash-bar the arm 6, projecting from it, makes an angle with sash-bar which is less than a right angle. Thus when the shutter 3 is closed against the outer surface of the sashbar, as in Fig. l, the arm 7 rests against the inner surface of the same and the arm 6 is inclined relatively to the line between the ful-l crum and the point of attachment of the link 5 to the shutter, so that any force tending to open the shutter acts through the link 5 and has the effect only of forcing the arm 7 tightly against the sash-bar, thus effe'ctually locking the parts. On the other hand, when the shutter is opened to its fullest extent, (see Fig. 2,) the arm 7 rests against the sash-bar on the opposite side of the fulcrum. `The connection betweenV the link 5 and lever-arm 6 is again out of alinement with the fulcruin and the point of attachment of the link to the shutter, and forces acting to close the shutter only tend wto increase' the amount by which this connection is out of line, and so press the -arm 7 against thesash-bar. Thus the shutter IOO before stated, like the cranks of certain forms of engines. This freedom of movement of the link 5 past the fulcrum of the lever is a very important feature of my invention, as Without it the shutter could not be locked when closed, as is here done, by the simple relation of the parts, but would need to be provided with additional locking means, and, further, the shutter may be held closed wit-h a force as great as the stiffness of the materials will permit, for in the closed position the arm 6 and link 5 together constitute a toggie-joint, by which great force may be 0btained. A lever of any other form would not permit the link 5 to act in the manner described.

In order that a more perfect closure of the shutter 3 may be obtained, the edges of the shutter are bent inward to form a marginal fiange or lip 12, the edges only of which come in contact with the outer surface of the sashbar, the body portion of the shutter being offset from said outer surface, as shown in Fig. 4. The area of contact of the shutter with the sash-bar (the thickness of the material of which the shutter is made by the length of three edges of the same) is thus much less than it would be if the surface of the body portion of the shutter rested directly against the surface of the sash-bar, and so a given force acting to close the shutter exert-s a greater pressure per unit of area of contact, and the Wind is more eifectually excluded. The shutter is also less liable to freeze fast to the sash-bar in cold stormy weather when constructed as described than if allowed to lie flat against the dat outer side of the sashbar. The flange or lip 12 surrounds the perforated portion of the sash-bar, or, in other Words, the outer ends of the perforations in said bar.

Although I have shown the air-admitting means as a series of holes, I do not conne myself to that particular form, but may use apertures of Whatever number, size, or shape may seem most desirable, and also the ventilating device need not be applied only to the bottom bar of a window-sash, but may be fitted to the top or side bars as Well.

A great advantage that I claim for my device is its simplicity, cheapness, and the ease with which it can be applied. The shutter may be made of sheet metal pressed or bent into the shape described and provided with a simple hinge. The bell-crank lever and connecting-link may preferably be of sti wire, which can easily be bent int-o the required form, and the bearings which constitute the leverfulcrum may be ordinary screw-eyes.

In applying the device it is only necessary to bore a few holes in the sash-bar, attach the shutter to the outside of the bar, aiiix the screw-eyes 8 and 9 at proper places on the inside, slip the trunnions l0 and 11 into their bearings, (the shape of the bell-crank lever and the elasticity of the material allow it to be easily done,) and connect the shutter with the lever.

No great accuracy in the length of the link connecting the lever with the shutter is required, for if the link is a trifle short there will be no diiiculty in bringing the lever to its closed locking position, as it will yield sufciently to enable the link to move past the fulcrum and come into locking relation with the lever.

Vhat I claim as new is- 1. In an apparatus of the character specified, having a perforated sash-bar and a shutter hinged to said sash-bar and adapted to cover the perforations in the same, means comprising a bell-crank lever having an arm 6 connected with the shutter by a link and constructed substantially as described to allow the said link to pass the fulcrum of the lever, a fulcrum advanced beyond the snrface of the sash-bar, and a U -shaped arm 7 substantially at right angles to the said arm 6 and adapted to bear against the surface of the sash-bar, for operating the shutter and locking the same when closed and when opened to its fullest extent.

2. The combination with a perforated sashbar, of a shutter hinged to the outer side of the bar and formed to cover the perforated portion thereof, and shutter-operating means comprising a bell-crank lever hinged to the inner side of the sash-bar, and a link con necting one arm of said lever with the shutter.

In testimony whereof I have axed my signature in presence of two Witnesses.

JOHN A. RUSSELL.

Witnesses:

HARRY L. DENNIsoN, C. W. BARRETT. 

